seat belt stuck on 2001 Mitsubishi Diamante

the front passenger side seat belt is retracted and it will not budge super tight. the door panels that hide the seat belt are unfasten from the tension on the seat belt

Asked by for the 2001 Mitsubishi Diamante
Sounds like it's time for a new seatbelt. you can get one from the Mitsu dealer. There have been times I've found a coin or paper clip jamming the reel, but usually it requires a belt assembly.
If you want to find a specialist, here's a directory link for you: